[Feature Request] Stylus (S-Pen) support via `RETRO_POINTER`

[f4mrfaux]

I’ve submitted a PR to RetroArch adding Samsung S-Pen / stylus support through the [RETRO_POINTER](https://docs.libretro.com/development/retroarch/input/#pointer) interface:

👉 [libretro/RetroArch#18201]
This enables stylus devices to act as a proper pointer/lightgun input inside cores. For PlayStation, that’s especially relevant for:

• Mouse-based games (e.g., Policenauts, Myst, Discworld, etc.)
• Lightgun games (e.g., Time Crisis, Point Blank, Elemental Gearbolt)

Using a stylus makes mouse-style titles much more usable on touch devices and makes lightgun games feel closer to the authentic arcade experience.

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Why I’m posting here

Once the RetroArch side lands, SwanStation may need small adjustments to ensure stylus input feels smooth and consistent. I’ve started experimenting in a forked branch:

👉 f4mrfaux/swanstation — stylus/spen-support

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Tracking / References

• Main RetroArch PR: [libretro/RetroArch#18201](ANDROID S-Pen stylus support RetroArch#18201)
• SwanStation test branch: swanstation — stylus/spen-support

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I’d like to use this issue to give maintainers a heads-up and provide a place for SwanStation-specific notes or feedback as this develops.

Thanks!